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Garden Tractors Discussion Forum

318 not running right

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Todd

01-01-2004 20:04:13




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I'm restoring a 1983 318 with the B43G Onan engine in it and can't get it to run with full power. In order to keep it running, I had to keep the choke shut. The fuel pump is working and it's getting enough gas. The compression is good, the points are new and the gap is set at .016, the condenser is new, and it has a carb rebuild kit on it. There is air blowing out of the intake valve on the compression stroke for each piston. The timing marks are lined up, and the valve clearance is ok. Both of the valves close completely, but it just takes the intake valve a while to close (the piston is about 2/3 of the way up on the compression stroke before it's completely shut). Is it normal for air to come out of the intake valve on the compression stroke on this engine? Any ideas on what could cause this or somethig else that may be wrong? Thanks.

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ohblu

01-10-2004 14:12:02




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 Re: 318 not running right in reply to Todd, 01-01-2004 20:04:13  
You can check the valve timing on most engines by checking the overlap @tdc of the EXHAUST stroke. Most unmodified cams will have both valves slightly but equally open. If one valve is open more than the other the cam is advanced or retarded.



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Matt

01-03-2004 22:21:09




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 Re: 318 not running right in reply to Todd, 01-01-2004 20:04:13  
I'd try all the stuff that everyone's said to do first. If your engine still isn't quite right, I'd look into the coil. My 1969 John Deere 110 Kohler K181s had a bad magneto that would cause it to run at idle only...and it acted much like the carburator was out of adjustment and I always had to run it on full choke. But I imagine if you're getting the intake opening on the compression stroke that something is out of time and I'd work on that first. Good luck.

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Todd,

01-03-2004 15:43:56




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 Re: 318 not running right in reply to Todd, 01-01-2004 20:04:13  
Everything you talk about points to the camshaft not installed properly, you need to pull on head off and see at top dead center on the compression stroke, does the valves each open when you turn the piston before and after TDC. if they do not open and close as the you turn this way, then you have a cam out of time. If it still leaks, check for a cracked or broken valve seat, I have had several engines with good (75-95PSI) compression, and still leaking past the intake/exhaust valve. Wo also check that out.

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BIGBLUE

01-02-2004 10:58:23




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 Re: 318 not running right in reply to Todd, 01-01-2004 20:04:13  
CHECK YOUR INTAKE MANIFOLD THERE IS A SEAM WHERE THE TWO HALFS ARE PUT TOGETHER THEY ARE KNOWN TO LEAK AT THESE SEAMS THIS WILL MAKE YOU HAVE TO RUN WITH CHOKE ON



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buck

01-02-2004 08:30:11




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 Re: 318 not running right in reply to Todd, 01-01-2004 20:04:13  

From all that I gather here I think you have the cam out of time.



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RusselAZ

01-02-2004 20:36:29




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 Re: Re: 318 not running right in reply to buck, 01-02-2004 08:30:11  
Me too. The intake valve should be closed before the piston starts moving up on compression.



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gerard

01-03-2004 06:01:26




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 Re: Re: Re: 318 not running right in reply to RusselAZ, 01-02-2004 20:36:29  
todd, some gears have casting marks that can be mistaken for timing marks. an engine with cam timing off a few degrees, will run and have compression. heres a quick way to check cam timing. with the cylinder head removed, slowly rotate the crankshaft in the direction of rotation. as the exhaust valve just closes, the intake valve will just start to open. this is called valve crossover. on production engines, valve crossover occurs when the piston is at top dead center on the exhaust stroke. this condition indicates proper cam timing.

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gerard

01-02-2004 04:56:59




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 Re: 318 not running right in reply to Todd, 01-01-2004 20:04:13  
a bit confused when you say air is blowing out of the intake valve. do you mean the spark plug hole or the intake port? any recent work done to the engine?



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Todd

01-02-2004 07:18:18




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 Re: Re: 318 not running right in reply to gerard, 01-02-2004 04:56:59  
When I say air is blowing out of the intake valve, I mean the intake port were the carb would mount. The engine was bored recently and I can't get it to run right since.



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Dave

01-02-2004 02:07:36




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 Re: 318 not running right in reply to Todd, 01-01-2004 20:04:13  
Todd - When I first read your post, the first thing that came to mind was a dirty carb. But you indicated it has a rebuild kit.

I'm going to list some things, some may seem quite simple, but are none-the-less easy to overlook.

Air filter is clean?

Carb gasket to manifold is not leaking?

Governor is properly adjusted?

Dashpot is properly adjusted?

Valve clearance is according to spec, not just seeming to work properly?

Fuel filter is good and installed in proper direction?

Fuel line does not have any hairline cracks?

Reed valve or its spring in head is not broken?

Breather tube is not clogged and filter media is clean?

Crankcase has proper vacuum? Vacuum lines are not cracked?

As you can see, there are numerous areas that can cause the problem you are having. If you don't have a technical service manual yet, you really should order one. You can call Deere Service Publications at 1-800-522-7448. Good luck - Dave

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Todd

01-02-2004 12:04:20




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 Re: Re: 318 not running right in reply to Dave, 01-02-2004 02:07:36  
I checked everything you said to, except the dashpot and vacuum, and everything is ok. What part of the tractor is the dashpot? And, where is a good place to get the tester to check the vacuum? How much do they usually cost? I already have the tractor tech manual and the engine tech manual.



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